Drill-steel retainer



W. A. SMITH.

DRILL STEEL RETAINER.

APPLICATION FILED AUG.\3,1920.

Patented July 5, 1921.

4W; ATfOREY FATE? WILLIAM: A. SMITH, OF PHILLIPSJBURG, NEW JERSEY, ASSIGN'OR TO IN'G-EBSOLL- RAND COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW 3 ERSEY.

DRILL-STEEL RETAINER. I

1,383,4l3si.

Specification of Letters Patent.

Patented July 5,, 1921.

Application filed August 13, 1920. Serial No. 403,358.

To all whom it may concern:

Be it known that I, WILLIAM A. SMITH, a citizen of the United States, and a resident of Phillipsburg, county of Warren, and State of New Jersey, have invented certain new and useful Improvements in Drill-Steel Retainers, of which the following is a specification.

This invention relates to drill steel retainers of the type in which a ydke embraces the steel and is suitably held or clamped in position upon the front head of the rock drill. I

The primary object of the present invention is to produce a yoke retainer so constructed that after it is struck by the collar of the drill steel, for instance as the drill steel comes, forward, the yoke tends to bind instead of being thrown outwardly away from the steel.

Another object of the invention is to secure a yoke retainer which is held by spring pressed means independent of the sld'e bolt springs and may be readily and conveniently adjusted and mounted on thefront head of the machine. I

To all of-these ends the invention consists of the retainer shown in its preferred forms in'the accompanying drawings, in which-- Figure 1 is a side elevation of the front head of a rock drill having the retainer applied thereto,

Fig. 2 is a view similar to Fig. 1 but wlth the rock drill turned through an angle about its longitudinal axis to show another side of the front head,

Fig. .3 is an end View of the front head and retainer with the drill steel shown intransverse section,

Fig. 4. is a detail side view of the end of one of the arms of the retainer,

Fig. 5 isa side elevation of a portion of the front head showing a modified form of retainer, partly in section on the line 5 of Fig. 6, and

Fig. 6 is a top plan view of Fig. 5 in horizontal section on the line 66. I

Referring to the drawings, A. represents a portion of the cylinderof a rock drill which may be of the hammer type, pro vided with the front head B having the nose piece C through which the drill steel D is adapted to extend into position to receive the impact blows of the hammer. In this instance the steel is provided vi $21M hold the drill steel, in

collar E and the drill steel retainer is shown in the form of a yoke F having a loop portion G adapted to. embrace the drill steel and provided with arms H having ends or heads J suitably constructed forpivotal attachment to the retainer bolts K which are independent of the side bolts L for holding the parts of the machine together.

In this instance a curved plate 0 is adapted to partially encircle the nose piece C of the rock drill and is secured to the front head B by means of the side bolts L. This curved retainer plate 0 extends out-v wardly at the sides at the portions P beyond the front head B, as indicated particularly in Fig. 3, and the retainer bolts K pass rearwardly through these outwardly extending portions P of the retainer plate 0, with the heads Q3 of the said bolts in front of the plate 0. Springs R are placed over the shanks of the bolts K and securing devices, which may be in the form of nuts S provided with cotter pins T, hold the springs on the bolts. The heads J of the arms H of the spring retainer in this instance are provided with pivot pins or gudgeons U adapted to be inserted in the side bolts K to form pivoted connections between retainer and the bolts.

In accordance with the construction described, the retainer bolts K are offset from the longitudinal axis of the machine and also from the side bolts L, and means are provided for clamping the retainer F in position to this. instance the heads J of the arms H being provided with fiattened portions V and W forming an angle with each other so that when the retainer or yoke F is forced or sprung into the position shown in Figs. 1 and 2, it will be automatically retained in such position, with the flat portions V of the heads J bearing against the under side of the plate 0 and will remain in such position even after the retainer is struck by the collar E of the drill steel, as the steel comes forward. Any such blow upon the retainer F will tend to cause the retainer to bind more tightly on the drill steel rather than assume the position indicated in'dotted lines in Fig. 1, and this construction jprevents the retainer from springing away om the steel on impact.

In the modification shown in Figs. 5 and 6, the retainer F is provided with bent ends 0: adapted to enter the apertures b in the heads of the retainer bolts K and these bolt heads in this instance are provided with stops d to limit the movement of the retainer in one direction and are also provided with cam portions 6 over whichthe retainer arms H are sprung into the sockets f in order to clamp the retainer in holding position for retaining the drill steel.

I claim:

1. A drill steel retainer for rock drills comprising a curved plate adapted to partially encircle the nose piece of the front head of the machine and secured to the front head by the side bolts, said plate extending outwardly at the sides beyond the front head, retainer bolts passing rearwardly through the outwardly extending portions of said plate. with the heads of the bolts in front of said plate, springs on the shanks of said bolts and securing devices to hold ,the springs on the bolts, a yoke retainer pivotally connected to the heads of said bolts and having a looped portion adapted to partially encircle the drill steel shank, and means for clamping said yoke in position to retain the drill steel.

2. A drill steel retainer for rock drills comprising a tially encircle the nose piece of the front head of the machine and secured to the front head by the side bolts, said plate extending outwardly at the sides beyond the front head, retainer bolts passing rearwardly through the outwardly extending portions of said plate, springs on the shanks of said bolts and securing devices to hold the springs on the bolts, a yoke retainer pivotally connected to the heads of said bolts and having a looped portion adapted to partially encircle the drill steel shank, and means off-set from the longitudinal axis of the machine for clamping said yoke in position to retain the drill steel.

In testimony whereof I have signed this specification.

- \VILLIAM A. SMITH.

curved plate adapted to par- 7 

